Abstract: Against the backdrop of the Russia-Ukraine conflict and the intensification of great power rivalries,the successive accession of Finland and Sweden to the North Atlantic Treaty Organization (NATO) has radically changed the security landscape in Europe and the Arctic region The Arctic security cooperation between the United States and the Nordic countries has become increasingly close. Looking back at the history of Arctic security cooperation between the US and the Nordic countries, the security cooperation between the two sides in the Arctic region has shown characteristics such as multi-grade cooperation led by the US, multi-field cooperation with military cooperation as the focus, and the construction of a multi-dimensional and compounded cooperation mechanism based on bilateral cooperation. In general, the US Arctic security cooperation with the Nordic countries is mainly affected by the interactions between the US, the five Nordic countries, and the relevant third-party subjects such as Russia; the degree of fit between the US and the Nordic countries’ Arctic policy issues, the effectiveness of the Arctic governance mechanism; and other factors. At present, common identity and threat perceptions have laid the foundation for Arctic security cooperation between the US and the Nordic countries, and the security cooperation between the US and the Nordic countries in the Arctic region will increase in the future with the“NATO flag”already planted all over the Nordic countries. However, there are also differences between the US and the Nordic countries in terms of pursuit of power, issue selection and strategic means in the Arctic region, and the Arctic security cooperation between the two sides is still uncertain.

Key words: United States, the Nordic countries, Arctic, security cooperation